Patents by Inventor Tatsuro Higashi

Tatsuro Higashi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Information recording disk having a stepped central recess and hub configuration
    Patent number: 5504735
    Abstract: An information recording disk formed from two substrates with a stepped central opening for receiving a hub within the stepped recess of at least one of the substrates is provided. In one embodiment, the central aperture of the first substrate is larger than the central aperture of the second substrate to form the stepped recess. In another embodiment, at least one substrate has a stepped surface defining a central aperture and a hub structure is mounted within this stepped recess to reduce overall thickness of the disk.
    Type: Grant
    Filed: December 6, 1993
    Date of Patent: April 2, 1996
    Assignee: Seiko Epson Corporation
    Inventors: Tsutomu Ota, Mamoru Sugimoto, Yasuto Nose, Hidetoshi Yoshitaki, Tatsuro Higashi, Takashi Hayashi
  • Information recording disk
    Patent number: 5265086
    Abstract: An information recording disk formed from two substrates with a stepped central opening for receiving a hub within the stepped recess of at least one of the substrates is provided. In one embodiment, the central aperture of the first substrate is larger than the central aperture of the second substrate to form the stepped recess. In another embodiment, at least one substrate has a stepped surface defining a central aperture and a hub structure is mounted within this stepped recess to reduce overall thickness of the disk.
    Type: Grant
    Filed: July 29, 1992
    Date of Patent: November 23, 1993
    Assignee: Seiko Epson Corporation
    Inventors: Tsutomu Ota, Mamoru Sugimoto, Yasuto Nose, Hidetoshi Yoshitaki, Tatsuro Higashi, Takashi Hayashi